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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02e23cdb73e2540d94a0ecd08f208ad60a2289a4e401c4002a7601689db34f5' 
  AND token = 'aKM0B4oq7rWMpomxQ+Q1j2T+vC/I7w8eW7OtKs9yb8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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