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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2c520b05618fd33a0520d48c8780978901aa9ed1d4832346892cfb90dc1a3a' 
  AND token = 'phemqn7Skk7u2rxMxTJwr2IOjXgoYvOTLDWx1I+c5X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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