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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af2e4eaf3fb93b30701265b65e9b7846deb1548ce88ff6c2c49efb213769e732' 
  AND token = 'e82g/0Vs163Uqn3i1+0RplxwIzMtJK3AWJm01mFduLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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