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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc43d342316bb368681ac61d7f19b274495045e2ba6a611d34ec4d5e2d294b0' 
  AND token = 'aEGfDrqioWV5v39XFskn6rgCwSXuRJuGMwb6h/t/60c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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