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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d615bc4e59dac2d9f854f4e764e315f461a65510d8b9f3f9b158ebea6a112e' 
  AND token = 'sL2SBBsvRh6kTzuvZ8DvQWhfAdT9iiGhVYK501LqugE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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