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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec1db56c5ca4187855bdf557f24a6c3855ee735737a9b90abbf1cf02f80b4fd' 
  AND token = 'Y3fIUWRMOtwO9CPnJujA3M4H+Vfkw5+yvIci4oFRRy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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