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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c57ad573232cb227f62c6125f7b9c1c4805bc48f1065fd6a3af8ac8f5fa78ab1' 
  AND token = 'wwQLLwYeU4agNFYPxuNPkn4O9HgSrnlRmUW15bu+Aeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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