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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0759a752c57510cc32aedaca187d367ed02441cfdc6a451355ee18b1444d665c' 
  AND token = '16TX+Bi31VRdleDOmsb3Pd0QzZO/KIVVSLczTI7h5po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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