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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ef6b064a1e992212058d472fe7bc1c20729266b6720f6202302586174b17c1' 
  AND token = '8br70AQEAQZHBvk68lHIeHMMy1kn1o+o7m3beQWq2n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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