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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261abcb25c0721e1423635e59481ed09cbfc8b8555fdcf849712b1f2fe1b0043' 
  AND token = 'Y+Wtoy6jD601L+TmN6tkG1hfPnCqCEX16pUc/kn0Vqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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