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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a132c3a87992ad27600e4adafd515eeb3b1d4a04983e3e353c1df6613ad89cb' 
  AND token = 'vM3+qlw16CnbmbKOe15kMgE00qGKwpF02qlaezsuoKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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