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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a936587267c2b6f4f0ae9e504c3fb131e04efedda6cde1bac9880c4d14e26b62' 
  AND token = 'EAgMCTAeAlp5Dbc5zvgDLoFgaCj+bc6Zl05+taVmr7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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