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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c611e2dd8a4a2ca543f99aff135ea78ebc1d1443448de3b8c26a7558f5e92cfc' 
  AND token = 'RkZpEK7o7drpoOoSjlCZUH2KewGaLlb3VseqL3Mc+8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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