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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2594ee46596f7c330d6c3610c16a310b0795578d8138295b33fa2dbc2b788f' 
  AND token = '5kLS5CKZpoBiw+5CscCk8GVkp6fU4POURzAk6a4pjQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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