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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5df4fe97cc8210c6d2fa8057dfed6bf82cb4cfe2b2c2ee4c722ef168fd0ed9c1' 
  AND token = 'r94NhcwAobkL1SkiuQ1CUkG3/4a/aJR5/c9JWFemIqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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