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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0983afb03a5582845635d89cdf1a1ba003920e15dde4a5fcb8df01b1b763ae0' 
  AND token = 'gYgCsZliC9Iy38esK+8PB8YMbjFMC4vZfZ+F/f0euPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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