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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd81e3ceab37bc48bb0b5a3e4c5c0d78c6b7254d16d51f7d848276b60c84a8b' 
  AND token = 'dopasdrOJslBDTYCuf8ieC/R0v+cLvP+yW1rhf5w46k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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