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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a811b6e2fa49cc6faa4e63a92c024122f1f7934081db2df62739f2e5dd0305d' 
  AND token = 'AgLCNCLiWlm5c2mWzvwcBRfX81MM/MFUSO7yPNYOQ/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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