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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f761520ea0f74043e29bf79af0b8728e3f09779a95e722732c46973905cd83' 
  AND token = 'YKHEq6om2kSr+EimHSRcjPR34gqfR97P9Wxw5NZsoa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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