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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983a3042ac9f419b0e108beb3c948bc96bec4a03d34c0afc1c41e1a95bfa8ef7' 
  AND token = '194+EB/JDg9VhC/XigdF1NY4aNix0Cd8iz+DSBLEzdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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