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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62c5fa5b0b08d2781d990259adc2a7b1d62e24108e4c4c0b3a0df8535cdd9f8' 
  AND token = 'RgKDk0Bjm2Be03StGfa5ZAULErn06haGSLreUygatHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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