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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0cd5c131b28e030f56f18c1305acfddc9ee7e8a0c7da04878a1b458b7d942e3' 
  AND token = 'sU8YrYPb0fFSIpN7LXcCEcW+UTap6c6cYD4cc+qnveA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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