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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9050d5e920fd01b0048dd67cc59f205110bd0401866779a4c92924e1d94420ab' 
  AND token = 'cxcLtYyfyUrT2frZ/Y7+dOvS7J7ZGncA5vWN+fYauo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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