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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca403bfc08cda690756d558e7fb864b701e5eb6a1e2f4364d95f77ac30fac2b6' 
  AND token = 'vi7Y3nzAV0o9Pg5eu0/b5KxO86cqv6zRuviUy2v6RsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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