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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d5f6bf94fc701354d3cada10018c0e94a88fd82a313eed7c824d16fbad3ee7' 
  AND token = '/J1MoKVHRZ3p5/emSSaG0TiIDEqYhO388H4KxtEOL70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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