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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e92ed636763361969f324df79a8b0f9b80367d2c0291d5368d62fd08bb6994' 
  AND token = 'cM335d5WXGEV2L66Blt4oUG7sT5y84AF8LlTgsVa7Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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