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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1d4abdb642d0e2a955eaa2bd0b90f63141ec5c52767eec4d6c39aaf14467ae' 
  AND token = 'r5ifM52s4J5Yo82JUsRoDG74M4hbsuZtRBH6Gu+3EyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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