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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2324aa7c560f5fd02da6de40099e967601e75ba7a1965d0b2077f5957a521c5' 
  AND token = 'rHaDGoKdNRBMglo1HEEzLV/WWpb9VEg90pQzgCSZdDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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