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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bcb555e69d9e70ac8bf538a0dedf471775bbc26ac136a75bbf780288982aa58' 
  AND token = '9ET0mcVL/eVMxuQgdS/STazDheUYQw9YU2k2yOSM7s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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