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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8860b1af3af4ce6ad4fc14e6c006ee721551f061c70fe519937d9295b9633f02' 
  AND token = 'O8UijCQaO271AdHzdoApDRbSeestF8OvTCVLHbmBh/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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