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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7caf284ee21782c181d4323967d794c5b001390f1d4c879115b4bc48e7450ae' 
  AND token = '99g67G6iNQGt89iVP5p+ORf90/tE6R/4T4hRhbTLq1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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