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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c706488efa50b389e82a1690143b12290e9990a4ce25bd92f0910c310dddd036' 
  AND token = '/C5yLgp4JxK9nVQP+U8AsnXtHXocqSUeBzx6iChjtTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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