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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5235ffce3e852d76032ba268704cd2ebb8318e79ad8ad2116f2c91dbadfad1' 
  AND token = '9avgcRjyGq34fbgUG6GIncaJYx+GRXHTpenQMwwtvvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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