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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f202273bb013482d28725e168029a41fcddbb5134a213b1c0b1a0cbe7647ad' 
  AND token = 'gl4ez0CIcozRTbwoR2H7A/e3F8zNPRpztwMUpgOP+pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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