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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17005b1bae0eac005fec7212fede53a44b40d16c50903dfbe94b9f3f072379e0' 
  AND token = 'fYR8334E1veDScFIEe0Sf+QYddkprTofYQ5EGV9ts5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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