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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ce137801ff31633f89c266855913cb668948d49515e3f5d67b36c91eba804d' 
  AND token = 'Tw4E5mySVMdsAraHFZpDW4UnOLflnn7EoDLlHoJw7o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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