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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e2da2d7e3fe66cd266779e77e74960d55a83d6aaab12d0f612373231558eb9' 
  AND token = 'lnstp9XCYgKULOIukR169V+ORyYbTcavTg9G6Nx5EDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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