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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c6775447527464c121bf6c5e4b6e2164cc22288fa04cc8240bd02b776d97d3c' 
  AND token = '0T76OmRk+qRe5g+L81AxFYDPZ3GvAFefGxCsurLq4ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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