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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee98454ab5794227d2eb598bafcb0090b724b17999e970919d2986d92e97253' 
  AND token = 'T1dtS1xV9po46jdG8a99bnqJChcUeUc+5kEMpS2Iy/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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