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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df03ca4bc4cd79f388389176188d18ce61938a66f3bc40d8e9e1dee0151e19fa' 
  AND token = '/XqRJJZqMI4KfaJRI5hrs7QbjiOAzRpHet2Mvs2njSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}