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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2668cfcee5f20dd944066e506bac76de6760f9942b37eef9abe5f4589cb98b9' 
  AND token = 'lFfjwBtcQ52P1qo3o5bONE4MFPyPJlhRd8d6rYj1fok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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