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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab39a9828e0f776081edbd7a9fdccebcd146a945284ce162f4dfa53cd6ba5ff9' 
  AND token = 'm+r+BfqVyEm+3B8n/gT3F04bpb+28lvFANb5ltUh/0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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