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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a64ec1befa24a4a2640f14605bfc252af108c08c05dd9bf2c1239781cd1e9c97' 
  AND token = 'ff4IePvFjJkErabyG0IC6xY7+JNrsFP9IMZtM691pvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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