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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fedd8042c96cdd6068d308e81e7c1776491ea0a92f9defb15dd7a3e6b2b1d82b' 
  AND token = 'BP19ZnULBySfHHagFAJakc9O0GuFPbPF5uxxgHiRBZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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