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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67531a7dccc073c9274816b92a36579b02535f3281eaf0d957f7ca1577885f6' 
  AND token = 'OqbiML92kP62tR75KEX3EzlEuMSbG4CgTL0DYxl58fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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