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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8326812c5b2a1755234e6eeb92b5430a7ff31fad5c86691d89eafa45876b2cf' 
  AND token = 'y/LLi+sggV+y+gmT6ShSNwwRsW4Ybrw/8sz6bDh03VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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