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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d881eda66dd97aaa5e9af49e37c3796cb604f84024e9e073c9c213ff7ed7b8' 
  AND token = 'A9fCXtwCG6goOoq/pdgez2lkkBa5jOs83sv4/fAU/SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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