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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676a97f20b0bc62b0a02bf4c851ec94baa0f5e4aa8d1997741ef25c9a1981e39' 
  AND token = 'RYAnoNRDFO8F5TzKYu5/I3c8a7HIx2P/9jOJ/35A3Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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