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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f664b59d418cd457224e07c311e4a113e962392441eec157590b7341abd9c44a' 
  AND token = 'rDX5pMxPkPqcDK4/Hbpd5J+rX0Iq6nx4z7lC44reKV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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