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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebabe6a8314dba6158b110e562b50ad46e8ef27d378c49a1831f6ba74fab2aad' 
  AND token = '1cepVk+aoBhS6mJ+6KhGQXbftWjFlGlTNSyTdtBQdmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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