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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f02028af1eb2137ff10619e0aca59588c165179ad721b23fc2a5b557a1837f' 
  AND token = 'NJvLAU3wJTEhKoNvPYUH9n5HUfOaiz2gAG5wFs28JCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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